"During my 2014 fact-finding trip to Assam, locals frequently impressed on me how they believe the influx of “infiltrators” from Bangladesh is not only changing Assam’s culture, ecology, and demographics; they also are building support for radical Islam inside the state. I have been tracking the demographic change in West Bengal for almost a decade and have seen village after village on the border with Bangladesh, formerly with robust Hindu and Muslim populations, become entirely Muslim, the Hindu population having been forced to leave. The growth of Islamism in West Bengal through the influx of illegal immigrants from Bangladesh is well-documented."